Enhance Existing App with .Net Core Features

I'm in need of a skilled Backend Developer with .Net Core experience to update my existing application. The main goal of this project is to add new features to the app, specifically user authentication via email and password.

Ideal Skills and Experience:
- Extensive experience in .Net Core development
- Proven track record in backend development
- Prior experience in implementing user authentication systems
- Strong problem-solving skills for feature addition
- Excellent understanding of performance optimization techniques